Pump



L. H. JENSEN.

PUMP.

APPLICATION FILED IEB. I4, 1920.

1,396,214, Patented Nov. 8, 1921.

@y M., Mffmhgj the eiective power LAWRENCE H. JENSEN, OF ST. CHARLES, ILLINOIS.

PUMP.

Application led February 14, 1920. vSerial No.

To all u1/wm t m ay concern Be it known that I, LAWRENCE H. JENSEN, a citizen of the United States, residing at St. Charles, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Pumps, of which the followingis a. specification.

The invention relates to pumps of the hand operated type for infiating tires, tanks and the like; and it has for its object the provision of a pumpof a very practical character in that it may be operated with a maximum degree of efiiciency and may be lconstructed at a very low cost.

pumpofthe character referred to, in which exerted upon the pump handle rapidly increases piston by 'thepump compression within the with the Vincrease in pump cylinder.

n the accompanying drawings I .have illustrated a preferred embodiment of my invention, but it will be understood that changes in construction without departing from the spirit and scope of the invention as defined 1n the appended claims are contemplated.

In Figure 1 of the drawings, I have shown a side elevation of my improved pump with a portion of the handle being broken away, the position of the its stroke being shown in Fig. 2 is an edge elevation of the pump with the operating handle broken away and shown in Fig. 2a. Fig. 3 is' a sectional View taken on line .3`3 of Fig. l on an enlarged scale and showing aJv detail of construction. Fig. 4 is a similar view taken online 4-4 of Fig'.v 3. The device comprises essentially a foot or base plate 1, a pump cylinder :2 pivotally mounted upon the vbase 'plate and having `a piston 3 with .a rod 3a operatively mounted therein. 4 designatesa support also pivotally mounted on the base platel and providing a fulc-rum for an opera-ting arm 5 and a lever .6 connected at itsopposite end to the piston rod 3a.. The .operating arm.5 has .a

V movable connection with the lever ..6 which is designated generally by the numeral 7.

The .base 1 and pump cylinder V2 with the piston 3 and rod 3a may be of any usual or preferred construction, forming per se 110 ypart of the present invention, the cylinder 2 Specification of Letters Patent.

Patented N ov. 8, 1921. 358,657.

being provided with the usual outlet 8. The base plate has an upstanding portion 9 upon the upper end of which, on a pivot 11 is pivota-lly mounted a bracket 10 carrying the pump cylinder 2.

The support 4 to the base plate 1 and arially with the pivot pin 11. ly it comprises a pair o bars 4f" and 4J made of a length substantially greater than the pump cylinder and spaced apart as shown in Fig. 2. They thus form arigid swinging bracket or frame, the

10 upon the pivot pin The pivot pin 12 Valso serves as a pivotal support for the operating arm 5, being for t is purpose positioned a short distance from t e free end of the support 4. Simisupport 4:. VTh in form as shown in Fig. 2, comprising a pair of arms 5a and 5b spaced apart sufficiently to lit neatly between the bars 4a and 4b at their pivotal connection therewith, and connected at their upper c nds by means of a made rigid with the handle so as to engage in notches 15a in the upper ends of the arms 5a and 5, and the lower end of the handle 17 may be notched as at 18 (dotted lines Fig. 1) to engage with the pin 16 which is in the form of a clamp `screw provided with a wing nut to clamp the handle in position with Vreference to the arm 5.

The lever 6 is inthe form of a single bar, being spaced midway between the upper ends of the bars 4a and 4" upon the pivot pin 13 andsuitably connected with the upmember -19 and pivot 20.

lThe Sliding connection between the operatingarm 5 and the lever `6 may be of character, being preferably with a View to minimizing fric- Herein 4it consists of a U-shaped member for strap 21 pivotally mounted upon a pin22 carried bythe arms k5a and V5b of the operating Aarm5 at a point a short disi said arm. Upon lSaid pin 22, and fitting neatly be- 'shown in broken lines, the relative are in the position y tive leverage being tween the free ends of the member 21, is mounted a roller 23 which is adapted to operatively engage with one edge of the lever 6, the strap member 21 being proportioned so that the space between the roller 23 and the yoke of the strap is adapted to neatly receive the lever 6. It will be seen that the strap serves to maintain the lever and the roller 22 in operative association during Vthe return stroke of the operating arm and that in the operating stroke there is substantially no friction between the strap ahd the lever. In such operating stroke, as the parts are moved from the position shown in full lines in Fig. 1 to that position of the parts varies in order to effect a rapid movement of the piston rod when V.the compression with'n the cylinder is comparatively slight, and a slower movement of the rod and greater force upon it as the compression within the pump .cylinder builds up. And finally, when the parts shown in the operating arm exerts a maximum egree of force upon the pistin rod, the effecat this point, the greate'st.l In order to properly cordinate the rate of movement of the piston 3 with the position of the roller relative tothe lever 6, the latter may be suitably shaped as at 6a. As will be observed, the lever 6 and piston rod 3a form in effect a toggle the parts of which are adapted to be moved into substantial alinement in the operation of the arm 5.

It has been found in practice that the pump which I have thus produced is capable of use in filling steel tanks with coinpressed air to a degree of pressure several hundred pounds greater than is possible with pumps as heretofore constructed. This is due to the fact that the peculiar arrangement of the parts which I have produced, causes the effective leverage exerted by the operating handle upon the piston rod as the degree of compression within the pump cylinder rises to rapidly increase, thus enabling the accomplishment of a greater amountof work with the expenditure of a minimum amount .of effort by the operator. y

Moreover, the construction is very simple so that it may be cheaply manufatcured and 'is of relatively great durability.

I claim as my invention: Y

1. In a pump comprising a cylinder having a piston therein and a rod for operating the piston, the combination of a pivotally mounted support, a lever connecting said support with said piston rod, and an arm pivotally connected with said support at a point between the pivotal connection of said lever therewith and the pivoted end of the support, and a sliding connection between said operating arm and said lever.

2. In a pump comprising a cylinder havcluding a lever,

broken lines,

'support with the ing a piston rod, the combination of a pivotal support yor fulcrum, a pivotal connection between the support and the rod inand an operating arm operatively associated with said support and having a slidable connection with said lever whereby the effective leverage exerted by the arm` upon-the piston rod increases as the compression in the c. linder rises.

3. In a pump comprising a cylinder and a piston rod, the combination of a pivotal support, a lever connecting the free ends of said rod and support, an arm pivotally connected with said support a short distance from its free end and having a sliding connection with said lever, and means for swing/ing said arm. f

4L. In a pumpV comprising a cylinder and a piston rod, the combination of a support upon which the cylinder is pivotally mounted, a second support pivotally mounted upon the first support and of a length substantially greater thany the length ofthe cylinder, a lever connecting free end of the piston rod, an .arm` pivotally connected with the second support at a point removed fromV the connection of the lever therewith, means for swinging the arm, and means slidably connecting said arm with Vsaid lever whereby the effective force transmitted by the lever from the arm to the piston rod increases gradually as the rod approaches the end of its stroke.

5. Ina pump comprising a cylinder and a piston rod, the combination of a support upon which the cylinder is pivotally mounted, a second support pivotally mounted upon the first support and of a length substantially greater than Vthe length of the cylinder, an operating arm, a leverY connecting the free end of the second support with thefree end of the piston, a connection between said arm and said lever comprising a VU-shaped strap pivotally mounted upon the arm and slidably engaging with one edge of the lever, and a roller carried by the arm and operatively engaging with the other edge of the lever. n n

6. In a pump comprising a cylinder having a piston witha piston rod, the combination of a member of aA length substantiallyV equal to the Acombined length of the cylinder and piston rod, said cylinder and member being mounted for relative swinging movement, a member pivotally connecting the free end of theirstm'entionedmember with said rod and-forming` with said rod in effect autoggle, and means fulcrumed on the first mentioned member and slidably connected with the second member for movement relative to the latter whereby to move the parts constituting the toggle substantially into alinement.

l 7 In a pump having alpiston rod, the combination of a support, a lever pvoted. t0 13 piston with reference to that of the operating arm.

9. In a pump having a support and a cylinder arranged to swing relatively to each other, in combination, a piston rod, a lever pivotally connected to said support and to said piston rod, and an operating arm pivoted on said support and slidably conneoted to said lever to apply force thereto progressively between said support and said piston rod and-drive said piston rod.

In a pump having a supportand a operating arm pivoted on said Support and having means for Slidably engaging the said edge of said lever to operate said piston rod.

In testimony whereof, I have hereunto set my hand.

LAWRENCE H. JENSEN. 

